<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      .topAction{
        width: 50%;
        display: inline-block;
        border: 1px solid red;
      }
      .actionArea{
        float: right;
      }
    </style>
  </head>
  <body>
    <div class="topAction">
      <span>今日要做</span>
      <div class="actionArea">
        <span>添加</span>
        <span>更多</span>
      </div>
    </div>
  </body>
</html>
